Renamed as the Diocese of Colombo in 1845, having lost territory to establish the then Apostolic Vicariate of Jaffna, now a suffragan Diocese
- Most Rev. Dr. Caetano Antonio Mulsuce CO, Bishop of Colombo from 1845 – 1857
St. Anthony’s College, Kandy
St. Sebastian’s College, Moratuwa
- Most Rev. Dr. Giuseppe Maria Bravi OSB, Bishop of Colombo from 1857 – 1860
St. Xavier’s College, Nuwara Eliya
- Most Rev. Dr. Hilarian Sillani OSB, Bishop of Colombo from 1863 – 1879
St. Benendict’s Institute, Kotahena
Good Shepherd Convent, Kotahena
St. Joseph’s College, Grandpass
St. Mary’s College, Pettah
St. Anne’s College, Kurunegala
Holy Family Convent, Kurunegala
St. Joseph’s College, Grandpass
St. Thomas’ College, Matale
St. Thomas’ Girls’ College, Matale
- Most Rev. Dr. Clemente Pagnani OSB, Bishop of Colombo from 1879 – 1883
St. Lucia’s College, Kotahena
- Most Rev. Dr. Christopher Bonjean OMI, Bishop of Colombo from 1883 – 1886
Davisamara Vidyalaya, Seeduwa
St. Andrew’s College, Puttalam